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The water that remained on the backlight section conducted as this section had voltage for the back light LED's resulting in failure of a track or a fusible resisitor on the board.
You need to use a good magnification glass or inspection lens with a desolderring station to touch up the cracked or damaged area to restore the connection to the backlight LED.

If the screen on your 5310 is deador the backlight is not working, you can buy a replacement 5310 LCD andreplace it yourself. A new Nokia 5310 display Screen costs about 20 dollars fromebay.I wrote a detailed guide to help you put in the new Nokia 5310 screen. Check it out at the following link: Nokia 5310 LCD Screen Replacement

Your bulbs to backlight the dash are burnt out. BUT, the good news is: It is EASY to pull the instrument pod.Remove the plactic fascia, and then remove the 4 bolts arounf the pos. Pull the pod towards you, top end first, and press the release clips on the severasl wiring connections. Then repplace whatever bulbs you need to. Plug i the wires & whap it back together. The wire connections are foolproof, one cannot be inserted into anothe hole. Nice.